1. Department of Electrical Engineer and Information Technology, University of Napoli “Federico II”, Napoli, Italy
2. Department of Physics “Ettore Pancini”, University of Napoli “Federico II”, Napoli, Italy
3. SEEQC-EU, Napoli, Italy
4. Seeqc, Inc., Elmsford, NY, USA
5. Department of Physics and Astronomy, Northwestern University, Evanston, IL, USA